#root,
#root div {
    display: flex;
    position: relative;
    min-width: 50px;
    justify-content: space-around;
    height: 50px;
    border-radius: 100%;
    margin: 100px 10px;
    border: 1px solid #000;
}
#root span {
    position: absolute;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 50px;
    left: 0;
    border-radius: 100%;
}
button {
    background-color: red;
    color: #fff;
    margin-top: 20px;
}
#root.select,
#root .select {
    background-color: blue;
}
.select>span {
    color: #fff;
}
.checked {
    background-color: blue;
}